From: John Tsiombikas <nuclear@member.fsf.org>
Date: Sun, 25 Apr 2021 14:22:29 +0000 (+0300)
Subject: fix
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=gbajam21;a=commitdiff_plain;h=11d447b3ef2de519e646802c0721e07cd5596133

fix
---

diff --git a/src/gamescr.c b/src/gamescr.c
index 6eee713..23a8e21 100644
--- a/src/gamescr.c
+++ b/src/gamescr.c
@@ -91,7 +91,7 @@ void gamescr(void)
 }
 
 #define TUN_U(x)	((x) & 0x3f)
-#define TUN_V(x)	(((x) >> 7) & 0x1ff)
+#define TUN_V(x)	(((x) >> 6) & 0x3ff)
 
 __attribute__((noinline, target("arm"), section(".iwram")))
 static void draw_tunnel(void)
@@ -111,7 +111,7 @@ static void draw_tunnel(void)
 	tunturn = abs(tunsweep) & 0x1f;
 
 	zoffs = num_vbl;
-	uoffs = 0;//(flip ? -num_vbl : num_vbl) >> 2;
+	uoffs = (flip ? -num_vbl : num_vbl) >> 1;
 
 	top = vram[backbuf];
 	bot = vram[backbuf] + 159 * 240 / 2;
@@ -126,7 +126,7 @@ static void draw_tunnel(void)
 				angle = TUN_U(tun >> 16);
 				depth = TUN_V(tun >> 16);
 				tx = ~(angle - uoffs) & 0x1f;
-				ty = (depth + zoffs) & 0x1f;
+				ty = ((depth >> 1) + zoffs) & 0x1f;
 				pptop = tex[(ty << 5) + tx];
 				tx = (angle + uoffs) & 0x1f;
 				ppbot = tex[(ty << 5) + tx];
@@ -134,7 +134,7 @@ static void draw_tunnel(void)
 				angle = TUN_U(tun);
 				depth = TUN_V(tun);
 				tx = ~(angle - uoffs) & 0x1f;
-				ty = (depth + zoffs) & 0x1f;
+				ty = ((depth >> 1) + zoffs) & 0x1f;
 				pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
 				tx = (angle + uoffs) & 0x1f;
 				ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;
@@ -153,7 +153,7 @@ static void draw_tunnel(void)
 				angle = TUN_U(tun);
 				depth = TUN_V(tun);
 				tx = (angle - uoffs) & 0x1f;
-				ty = (depth + zoffs) & 0x1f;
+				ty = ((depth >> 1) + zoffs) & 0x1f;
 				pptop = tex[(ty << 5) + tx];
 				tx = ~(angle + uoffs) & 0x1f;
 				ppbot = tex[(ty << 5) + tx];
@@ -161,7 +161,7 @@ static void draw_tunnel(void)
 				angle = TUN_U(tun >> 16);
 				depth = TUN_V(tun >> 16);
 				tx = (angle - uoffs) & 0x1f;
-				ty = (depth + zoffs) & 0x1f;
+				ty = ((depth >> 1) + zoffs) & 0x1f;
 				pptop |= (uint16_t)tex[(ty << 5) + tx] << 8;
 				tx = ~(angle + uoffs) & 0x1f;
 				ppbot |= (uint16_t)tex[(ty << 5) + tx] << 8;